Move HeadstandComponent to Shared (#39377)

Move HeadstandComponent to Shared

Content.Shared/Administration/Components/SharedHeadstandComponent.cs

@@ -3,7 +3,7 @@
 namespace Content.Shared.Administration.Components;
 
 /// <summary>
-/// Flips the target's sprite on it's head, so they do a headstand.
+/// Flips the target's sprite on its head, so they do a headstand.
 /// </summary>
-[NetworkedComponent]
-public abstract partial class SharedHeadstandComponent : Component { }
+[RegisterComponent, NetworkedComponent]
+public sealed partial class HeadstandComponent : Component;